The double VCA is a 6 HP module that has two VCA circuits and a mixing circuit. The two VCA (gold and purple) are identical and organized vertically. The VCA level is only controlled by CV, the knobs are part of the mixer that mixes the VCA with a third input.
The circuit is based on the vintage VCA of electric druid. It uses the "more practical current source" as described there, since no mixing of current sources is needed.
The mixer is a simplified version of the Doepfer A-100 do-it-yourself page. It doesn't have the part that inverts it back to normal and it doesn't have an offset voltage. In fact, it doesn't even have a knob to control the volume of the third input.
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